Sewing-machine



J. WASSERSTEIN.

SEWING MACHINE.

APPLICATION FILED DEC. 19, 1919.

WWW

Patented Jan. 25, 1921.

UNITED STATES PATENT OFFICE.

JOSEPH WASSERSTEIN, OF BROOKLYN, NEW YORK, ASSIGITOR OF ONE-HALF TO I LOUIS BENDER, 0F BROOKLYN, NEW YORK.

SEWING-MACHINE.

Specification of Letters ratent.

Patented J an. 25, 1921.

Application filed December 19, 1919. Serial No. 345,920.

To all whom it may concern Be it known that I, JOSEPH WASSERSTEIN,

' a citizen of the United States, ,and resident of the borough of Brooklyn, in the city and State of New York, have invented a new and useful Improvement in Sewing-Machines, of which the following is a specification.

The object of my invention is to provide an improvement in sewing machines by means of which the surplus material along a stitched seam may be removed as the seam is stitched.

A further object is to provide a device of the above character in which a binding strip is passed through the presser foot in the path of the needle.

A further object is to provide a device of the above character which may be very readily applied to sewing machines now in use without materially altering the same.

A practical embodlment of my invention is represented. in the accompanying drawings in which,

Figure 1 represents a detail view partly in side elevation and partly in section, of so much of a sewing machine as includes my invention, the needle bar and knife being shown in their raised position.

Fig. 2 represents a similar view with the needle bar and knife shown in full lines in their raised position and in dotted lines in their depressed position.

Fig. 3 represents a detail front view of the parts, and

Fig. i represents a horizontal section taken in the plane of the line IV-IV of Fig. 3.

Fig. 5 represents a detail vertical section taken in the plane of the line V-V of Fig. 4:. v

The needle bar is denoted by 1 andthe needle by 2. The presser bar is denoted by 3 and the presser foot by 4. The table is denoted by 5 ,and the throat plate by 6. This throat platehas a knife slot 7 therein. It also has the usual slots 8 for receiving the feed dogs (not shown herein) which coact with the presser foot.

A. knife guide 9 is carried by the presser foot 4 and preferably forms an integral part thereof. A cloth cutting knife 10 is vertically movable in the guide 9. The upper end of the knife projects upwardly beyond the, guide 9 and aspring means, such for instance, as a coil spring 11 serves to normally hold the knife in its raised positionwith its cutting edge housed within the said guide. One end of the spring ll'is fastened by a screw 12 to the knife and the other end by a screw 13 to the guide.

The knife 10 is located in position to be engaged by the needle bar and depressed into the knife slot 7 every reciprocation of the needle bar, the head 14 of the needle bar forming a shoulder which engages the head of the screw 12 on the knife.

It will be seen that the arrangement of the parts is such that they may be readily removed and replaced. It will also be seen that the ordinary sewing machine ,may be quickly adapted for my improved attachment by cutting the'knife slot in the throat plate and by replacing the usual presser foot with my improved presser foot.

The presser foot is provided with binding strip slots 15, 16 through which a binding strip. 17 may be led in thepath of the needle 2 so that the binding strip may be stitched to the material at the time the seam is being stitched.

It is evident that various changes may be made in the construction, form and arrangement of the several parts without departing from the spirit and scope of my invention;

hence I do not wish to limit myself ,to the holdingthe knife in its raised position with its cutting edge housed within the guide.

.In testimony, that I claim the foregoing as my invention, Ihave signed my name this-16th day of December, 1919.

JOSEPH WASSERSTEIN. 

